13871257 has 4 divisors (see below), whose sum is σ = 13912756. Its totient is φ = 13829760.

The previous prime is 13871233. The next prime is 13871279. The reversal of 13871257 is 75217831.

13871257 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 6843456 + 7027801 = 2616^2 + 2651^2 .

It is a cyclic number.

It is not a de Polignac number, because 13871257 - 2⁷ = 13871129 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (13871357) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 20244 + ... + 20917.

It is an arithmetic number, because the mean of its divisors is an integer number (3478189).

Almost surely, 2^13871257 is an apocalyptic number.

It is an amenable number.

13871257 is a deficient number, since it is larger than the sum of its proper divisors (41499).

13871257 is an equidigital number, since it uses as much as digits as its factorization.

13871257 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41498.

The product of its digits is 11760, while the sum is 34.

The square root of 13871257 is about 3724.4136451259. The cubic root of 13871257 is about 240.2731669738.

The spelling of 13871257 in words is "thirteen million, eight hundred seventy-one thousand, two hundred fifty-seven".